JPH059135Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a valve molding device, and particularly to a valve molding device suitable for vulcanization molding a float valve.

[Conventional technology]

Conventionally, when vulcanizing a float valve, as shown in FIG. Slide type 53, disc spring 5
4. Support via the click mold 55 and fill the injection port 56
A valve molding device is used which is configured to inject a rubber material 58 into a pot 57 and press the rubber material 58 to the upper side of the metal fitting 50 with a piston mold 59.

When performing vulcanization molding of a float valve using the valve molding apparatus having the above configuration, the lower mold 52
After that, set the upper mold 5 on the lower mold 52.
Place 1 and close the mold.

At the same time as this mold tightening, the rubber material 58 inside the pot 57
is compressed by a piston mold 59, and a rubber material 58 is poured from an injection port 56 to perform molding.

As a result, the valve body 60 is attached to the upper side of the metal fitting 50 as shown in FIG.

When clamping the mold, the metal fitting 50 is crushed by the inner wall surface 51A of the upper mold 51 and the upper surface 53A of the slide mold 53 to prevent rubber from getting around the metal fitting 50.

Note that since the slide mold 53 is supported by a disc spring 54, it moves vertically when the mold is clamped, but the spring constant of the disc spring 54 is
The amount of crushing necessary to prevent the rubber from rotating is obtained, and the value is set to a value that does not cause deformation of the metal fitting 50.

[The problem that the idea attempts to solve]

However, when a float valve is vulcanized using a conventional valve molding device, if there are large variations in the roundness of the valve body mounting portion 50A of the metal fitting 50, as shown in FIG. The amount of crushing 61 necessary to prevent the rubber from rotating increases by the amount of variation in the roundness of the metal fittings 50.

For this reason, in order to increase the crushing amount 61,
When the set load of the disc spring 54 is increased, the metal fitting 50
Stress is concentrated on the small diameter portion 50B, and there is a risk that the small diameter portion 50B may be deformed as shown in FIG.

An object of the present invention is to provide a valve molding device that can prevent deformation of the valve body even if a large load is applied to the slide mold.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a valve body having a substantially hollow cylindrical shape with a valve body mounting part on the upper side and a hollow part on the lower side, and a rubber between the valve body mounting part and the valve body mounting part. An upper mold that forms a material injection path and supports the bottom side of the valve body mounting portion of the valve body, and a rubber material injection path is formed between the upper mold and the valve body mounting portion of the valve body, and the rubber material It can be moved in the vertical direction by a piston type that presses the rubber material in the injection path toward the upper side of the valve body, a lower mold that contacts the upper mold and supports the side surface of the valve body, and a biasing member. The valve molding apparatus is configured to include a slide mold that is installed in the valve body and supports the top side of the inner wall surface of the hollow portion of the valve body.

[Effect]

By adopting the above-mentioned means, the valve body is supported on its upper side by the upper mold, its side sides by the lower mold, and further supported by the slide mold inserted into the inner wall surface of the hollow part. Therefore, even if the pressing force against the slide die is increased, the stress is concentrated on the inner wall surface of the hollow part of the valve body, so deformation of the valve body is prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, a metal fitting 10 as a valve body
is formed into a substantially hollow cylindrical shape, and has a valve body mounting portion 11 on the upper side and a hollow portion 12 on the lower side.

The valve body mounting portion 11 is formed into a substantially truncated conical shape, and is provided with an annular rubber material mounting groove 13 .

The hollow portion 12 has a cylindrical large diameter portion 14, a small diameter portion 15, and a flange portion 16, and is formed with an insertion hole 18 extending in the axial direction from the bottom surface 17 to the vicinity of the valve body mounting portion 11. There is.

An upper mold 19 is disposed on the valve body mounting portion 11 side of the metal fitting 10, and a lower mold 20 is placed on the side surface of the metal fitting 10.
However, slide molds 21 are respectively arranged on the bottom side.

The upper mold 19 is configured to form a pot 22 as a rubber material injection path between the valve body mounting part 11 of the metal fitting 10 and to support the bottom side of the valve body mounting part 11.

The lower mold 20 is configured to come into contact with the upper mold 19 and support the side surface of the metal fitting 10.

Further, the slide mold 21 is fixed to the upper surface of the click mold 24 via a disc spring 23, and has a substantially cylindrical pole 25 erected in the center and an annular protrusion 26 on the outer peripheral side. A groove 27 is formed between the pole 25 and the protrusion 26.

This pole 25 is inserted into the insertion hole 18 and is configured so that its tip side comes into contact with the top side of the inner wall surface of the insertion hole to support the metal fitting 10.
The upper surface of is adapted to come into contact with the lower die 20.

Further, a piston mold 28 is arranged above the upper mold 19, and a rubber material 30 injected from the injection port 29 is inserted between the upper mold 19 and the piston mold 28. .

In the above configuration, the metal fittings 10 are set on the lower mold 20 and the slide mold 21.

Thereafter, the upper mold 19 is placed on the lower mold 21 and the molds are clamped.

Then, at the same time as mold clamping, the rubber material 30 in the pot 22 is compressed by the piston mold 28, and the rubber material 30 is further injected into the pot 22 from the injection port 29, and the valve body 30 made of the rubber material is inserted into the valve body mounting portion 11. Perform vulcanization molding to attach.

At this time, there is a large variation in the roundness of the valve body mounting portion 11 of the metal fitting 10, and in order to increase the amount of crushing required to prevent the rubber from turning around the metal fitting 10, the disc spring 23 is
Even if the set load is increased, the small diameter part 1 of the metal fitting 10
No stress is concentrated on 5.

That is, since the stress is concentrated on the top side of the inner wall surface of the insertion hole 18, it is possible to prevent the metal fitting 10 from deforming even if the pressing force on the slide die 21 is increased.

[Effect of idea]

As explained above, according to the present invention, the upper side of the valve body is supported by the upper mold, and the top side of the inner wall surface of the hollow part of the valve body is supported by the slide mold, so that the pressing force on the slide mold is reduced. Even if it is expensive,
It has excellent effects such as being able to prevent the valve body from deforming during vulcanization molding and contributing to improving the quality of the molded product.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention;
Figure 2 is a sectional view of the main part of the conventional example, Figure 3 is a sectional view of the metal fitting, Figure 4 is a diagram for explaining the amount of crushing, and Figure 5 is a diagram for explaining the deformed state of the metal fitting. . 10,50...Metal fitting, 11,50A...Valve body mounting part, 12...Hollow part, 14...Large diameter part, 15,
50B...Small diameter part, 16...Flange part, 18...
...Insertion hole, 19...Upper mold, 20...Lower mold, 21...
...Slide type, 23...Disc spring, 24...Clip type, 28...Piston type, 30...Rubber material, 6
0...Valve body, 61...Smashing amount.

Claims (1)

[Scope of utility model registration request] The valve body mounting part 13 is on the upper side, and the hollow part 1 is on the lower side.
A rubber material injection path 22 is formed between the valve body mounting portion 13 of the substantially hollow cylindrical valve body 10 provided with the valve body 1 .
Upper mold 19 supporting the bottom side of the valve body mounting portion 13 of No. 0
and the upper die 19 and the valve body mounting portion 13 of the valve body 10.
A rubber material injection path 22 is formed between the
The rubber material 30 in the rubber material injection path 22 is inserted into the valve body 1.
0, a lower mold 20 that comes into contact with the upper mold 19 and supports the side surface of the valve body 10, and a biasing member 23 to be movable in the vertical direction. , a slide mold 2 that supports the top side of the inner wall surface of the hollow portion 12 of the valve body 10;
1. A valve molding device characterized by comprising: